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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7e7e629001d9fbf62d5743a9fa790e3cb8619bac489d8b5fe035d5cbaf57850' 
  AND token = 'WOq0+/O6QApiFwl+OYS7G2gfIN3aas5VQzUtaHo+Rfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}